Article
Astronomy & Astrophysics
Dongwon Han, Neelima Sehgal, Amanda MacInnis, Alexander van Engelen, Blake D. Sherwin, Mathew S. Madhavacheril, Simone Aiola, Nicholas Battaglia, James A. Beall, Daniel T. Becker, Erminia Calabrese, Steve K. Choi, Omar Darwish, Edward Denison, Mark J. Devlin, Jo Dunkley, Simone Ferraro, Anna E. Fox, Matthew Hasselfield, J. Colin Hill, Gene C. Hilton, Matt Hilton, Renee Hlozek, Johannes Hubmayr, John P. Hughes, Arthur Kosowsky, Jeff Van Lanen, Thibaut Louis, Kavilan Moodley, Sigurd Naess, Toshiya Namikawa, Federico Nati, John P. Nibarger, Michael D. Niemack, Lyman A. Page, Bruce Partridge, Frank J. Qu, Alessandro Schillaci, David N. Spergel, Suzanne Staggs, Emilie Storer, Edward J. Wollack
Summary: The study presents Lambda CDM cosmological parameter constraints obtained from delensed microwave background power spectra, revealing internal consistency within the framework of the standard cosmological model. It also demonstrates that the shift in cosmological parameters between delensed and lensed spectra is predicted to be zero when fitting with the correct model, indicating a consistent gravitational lensing effect on the microwave background.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
J. M. Diego, G. Bernstein, W. Chen, A. Goobar, J. P. Johansson, P. L. Kelly, E. Mortsell, J. W. Nightingale
Summary: The observed magnifications and light curves of the quadruply imaged iPTF16geu supernova provide valuable insights into the lens system and suggest the need for contributions from microlensing structures. By combining macro and micro lens models, we find that higher stellar surface mass densities are preferred and conclude that microlensing from the baryonic component is sufficient to explain the observed flux ratios and light curves.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
L. R. Colaco, S. J. Landau, J. E. Gonzalez, J. Spinelly, G. L. F. Santos
Summary: This study proposes a new method to investigate the possible time variation of the speed of light and the fine-structure constant using Strong Gravitational Lensing and Type Ia Supernovae observations. The results suggest that while it is reasonable to treat the systems separately, no strong indication of varying c was found.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Rajorshi Sushovan Chandra, Tarun Souradeep
Summary: The study uses an improved deconvolution algorithm to reconstruct the Primordial Power Spectrum from Weak Lensing Power Spectrum, providing an independent method to observe and constrain the spectrum. The Weak Lensing Power Spectrum is cleaner and provides unique features over different K scales compared to the CMB Temperature Power Spectrum.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
J. Johansson, A. Goobar, S. H. Price, A. Sagues Carracedo, L. Della Bruna, P. E. Nugent, S. Dhawan, E. Mortsell, S. Papadogiannakis, R. Amanullah, D. Goldstein, S. B. Cenko, K. De, A. Dugas, M. M. Kasliwal, S. R. Kulkarni, R. Lunnan
Summary: In this study, spectroscopic observations of the strongly lensed Type Ia supernova iPTF16geu were reported. The measurements included resolving spectra of individual lensed supernova images with Hubble Space Telescope, detecting emission and absorption lines characterizing the interstellar medium in the host galaxy and lensing galaxy, and refining the velocity dispersion of the lens galaxy which significantly constrains the lens model. The study also involved using ground-based spectroscopy, magnified by lensing, to study the properties of a high-z SN Ia with unprecedented signal-to-noise ratio, indicating iPTF16geu as a normal SN Ia without significant deviations in spectral energy distribution due to microlensing effects.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Selim C. Hotinli, Joel Meyers, Cynthia Trendafilova, Daniel Green, Alexander van Engelen
Summary: Delensing CMB data can improve inferences on cosmological parameters, primary gravitational waves, and non-Gaussianities, while simplifying analysis. It offers various benefits without any changes to experimental or survey design.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Mathew S. Madhavacheril, Kendrick M. Smith, Blake D. Sherwin, Sigurd Naess
Summary: The power spectrum of cosmic microwave background (CMB) lensing will be measured with high precision in upcoming surveys, allowing for constraints on neutrino masses and cosmological parameters. A new estimator is proposed in this study that is robust against assumptions made in modeling or simulating instrument noise, providing efficient computation without substantial loss in signal-to-noise ratio. This new method relies on multiple splits of CMB maps with independent instrument noise to improve the accuracy of lensing power spectrum measurements.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Priyesh Chakraborty, Shu-Fan Chen, Cora Dvorkin
Summary: This paper explores the information content of the weighted skew-spectrum in extracting non-Gaussian information from bispectra of galaxies cross-correlated with CMB lensing, showing a potential 17% difference in constraints on bias and cosmological parameters compared to traditional bispectrum analysis. Theoretical skew-spectra are compared with those from N-body simulations, with emphasis on including gravitational non-linearities beyond perturbation theory. An algorithm for applying the skew-spectrum estimator is defined, providing percent-level estimates for the linear bias parameter b(1) through simulations.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Zhao-Feng Wu, Lok W. L. Chan, Martin Hendry, Otto A. Hannuksela
Summary: The mergers of supermassive black hole binaries can serve as standard sirens in the study of cosmology, but the weak gravitational lensing can induce significant errors in the measured distance. In this study, using numerical simulations, we find that the weak-lensing errors can be reduced by about a factor of two using convergence maps reconstructed from shear measurements. However, implementing such an approach would require expensive ultra-deep-field observations for every standard siren, making it impractical in most cases.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Tonghua Liu, Shuo Cao, Marek Biesiada, Yuting Liu, Yujie Lian, Yilong Zhang
Summary: The study introduces a new model-independent method to test the invariance of the speed of light in the distant Universe. Results show no significant deviation of the speed of light from the constant value within the uncertainty of current observations. The proposed approach may achieve higher precision in testing the deviation of the speed of light compared to previous methods.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Oliver Denton-Turner, Eugene A. Lim
Summary: This study demonstrates the equivalence between the 4th order calculation of weak lensing effects and the lens-lens coupling effects in the Born Approximation.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Julien Carron
Summary: This method proposes a way to estimate the response matrices of CMB lensing power spectra estimators to the true sky power in realistic conditions. By using a small number of Gaussian CMB Monte-Carlos and specially designed quadratic estimators (QE), accurate matrices can be obtained with minimal computational effort. It can be used to improve the modeling of CMB lensing band-powers by incorporating some of the non-idealities encountered in CMB lensing reconstruction. The method shows that the residual couplings induced by masking can explain the observed residual multiplicative bias on Planck simulations, eliminating the need for an empirical correction.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Martin White, Rongpu Zhou, Joseph DeRose, Simone Ferraro, Shi-Fan Chen, Nickolas Kokron, Stephen Bailey, David Brooks, Juan Garcia-Bellido, Julien Guy, Klaus Honscheid, Robert Kehoe, Anthony Kremin, Michael Levi, Nathalie Palanque-Delabrouille, Claire Poppett, David Schlegel, Gregory Tarle
Summary: Using luminous red galaxies selected from imaging surveys for targeting by the Dark Energy Spectroscopic Instrument (DESI) in combination with CMB lensing maps from the Planck collaboration, researchers probed the amplitude of large-scale structure over 0.4 <= z <= 1. Their findings suggest a slower growth of structure at low redshift than model predictions, with only modest significance.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Priya Goyal, Pravabati Chingangbam
Summary: This study uses the measurement results of weak gravitational lensing on the cosmic microwave background radiation to test the fundamental assumption of Statistical Isotropy (SI) of the universe, finding that the observed data is consistent with SI overall, but there are local regions with deviations with statistical significance higher than 95% confidence level.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Wendy L. Freedman, Barry F. Madore
Summary: One of the most exciting and pressing issues in cosmology today is the discrepancy between the local Hubble constant measurements and the values inferred from cosmic microwave background radiation. The James Webb Space Telescope has the potential to provide new data and insights to resolve these differences.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Rodrigo S. Goncalves, Susana Landau, Jailson S. Alcaniz, Rodrigo F. L. Holanda
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Astronomy & Astrophysics
R. F. L. Holanda, G. Pordeus-da-Silva, S. H. Pereira
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Astronomy & Astrophysics
R. F. L. Holanda, W. J. C. da Silva
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Physics, Particles & Fields
Kamal Bora, R. F. L. Holanda, Shantanu Desai
Summary: A new method is proposed to explore a possible departure from the standard time evolution law for dark matter density, using a deformed evolution law and constraining epsilon. The dataset used includes Strong Gravitational Lensing data and galaxy cluster X-ray gas mass fraction measurements, showing that the current dataset cannot rule out interacting models of dark matter and dark energy with high confidence level.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
L. R. Colaco, J. E. Gonzalez, R. F. L. Holanda
Summary: A new method based on large scale structure observations is proposed to probe the temporal variation of the fine-structure constant, obtaining limits on the physical properties parameter of the model at the level of 10^-2. The approach provides new bounds on the possibility of the fine-structure constant not being equal to 0 at different redshifts.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
L. R. Colaco, R. F. L. Holanda, R. Silva
Summary: A new method based on Strong Gravitational Lensing and Type Ia Supernovae observations is proposed to investigate a possible time variation of the fine-structure constant (alpha). Constraints on Delta alpha/alpha are obtained by considering a class of runaway dilaton models, providing independent bounds on a possible time variation of alpha at low, intermediate, and high redshifts within the redshift range covered by the data set.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
F. S. Lima, R. F. L. Holanda, S. H. Pereira, W. J. C. da Silva
Summary: Using strong gravitational lensing systems and Type Ia supernovae observations, this paper explores the consistency of the power-law mass density profile with the cosmic distance duality relation and finds that the verification of the relation is dependent on the lens mass interval considered. The study suggests that a single density profile may not be suitable for describing lenses with low apparent stellar velocity dispersion values, and is only an approximate description for lenses within an intermediate mass interval.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Physics, Particles & Fields
R. F. L. Holanda, F. S. Lima, Akshay Rana, Deepak Jain
Summary: In this paper, the redshift dependence of cosmic distance duality relation is tested using large scale structure observations. The results show that this relation remains redshift independent to a certain extent.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Kamal Bora, R. F. L. Holanda, Shantanu Desai, S. H. Pereira
Summary: In this paper, we test the standard law for the evolution of dark matter density as a function of redshift. We assume a flat universe and the validity of the FRW metric. We consider a deformed dark matter density evolution law and obtain constraints on the parameter epsilon by combining galaxy cluster gas mass fractions with cosmic chronometers measurements. Our results show that epsilon = 0 within 2 sigma c.1., which is consistent with other recent analyses.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
I. E. C. R. Mendonca, Kamal Bora, R. F. L. Holanda, Shantanu Desai
Summary: In this study, possible cosmological signatures were searched for using galaxy cluster gas mass fraction measurements and cosmic chronometers. The results show that no significant departure from general relativity was found regardless of assumptions about cosmic curvature or a possible depletion factor evolution in cluster measurements.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Darshan Kumar, Akshay Rana, Deepak Jain, Shobhit Mahajan, Amitabha Mukherjee, R. F. L. Holanda
Summary: This study provides observational evidence for the validity of the cosmic distance duality relation and its correlation with parameters of cosmic acceleration and spatial curvature. The results suggest a flat universe with no evolution of absolute magnitude, but with a slight inclination towards a non-flat universe.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
R. R. Cuzinatto, R. F. L. Holanda, S. H. Pereira
Summary: A minimal model based on the Co-varying Physical Couplings (CPC) framework is proposed, which allows the couplings {G, c, ?} to vary simultaneously. The model is constrained using observational data of galaxy cluster gas mass fraction. The results show that the functions c(z) and G(z) = G(0 )(c/c(0))(4) are compatible with constant couplings for the two different parametrizations of c = c(z) adopted in this study.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Physics, Particles & Fields
Kamal Bora, R. F. L. Holanda
Summary: In this paper, a self-consistent test for estimating the Hubble constant using galaxy cluster and type Ia supernovae observations is proposed. The method involves obtaining the observational value of the galaxy cluster scaling-relation and using it along with SNe Ia observations to estimate H-0, in agreement with recent results. A comparison is also made with a method using hydrodynamical simulations of massive galaxy clusters to obtain the C parameter.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
R. F. L. Holanda, Kamal Bora, Shantanu Desai
Summary: In this work, we discuss a new method to probe the redshift evolution of the gas depletion factor and find a mildly decreasing trend as a function of redshift at about 2.7 sigma.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
S. H. Pereira, A. M. Vicente, J. F. Jesus, R. F. L. Holanda
Summary: A cosmological model with torsion in an Einstein-Cartan framework is studied. The contribution of torsion function as a dark matter component is investigated using two different approaches. It is shown that both models are compatible with recent cosmological data.
EUROPEAN PHYSICAL JOURNAL C
(2022)